Here's one of the darker scenarios that pops into my mind, and who is to know what is far-fetched in these days. It seems to be the consensus that Trump may be racking up possible indictments (collusion/ conspiracy might not be one of them, but there are plenty of others) . It is also the opinion of many in the Department of Justice that a sitting president cannot or should not be indicted. But, when he is no longer president he is fully eligible to be indicted for all these things. Therefore, in Trump's mind, the only way to avoid a flood of indictments is to remain president as long as he can. That means rigging the election of 2020, and if he still loses, then to invalidate the election by "executive order" or simply call a "national emergency" and declare he must remain in office because it's a national emergency. And since McConnell seems to have the right to not call any opposing bill to a vote in the Senate, the deal is done. Have a happy day.